Difference between revisions of "IAC 2-28-08"
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* The gun voltage was put 0.45 and saw 10% of the pulses may be multiple electrons were seen in the PMT based on looking at the scope trace. | * The gun voltage was put 0.45 and saw 10% of the pulses may be multiple electrons were seen in the PMT based on looking at the scope trace. | ||
* The gun voltage was put 0.5 and saw 10% of the pulses may be multiple electrons were seen in the PMT based on looking at the scope trace. | * The gun voltage was put 0.5 and saw 10% of the pulses may be multiple electrons were seen in the PMT based on looking at the scope trace. | ||
| + | * The gun voltage was put 0.8 and started to see increase in multiple electrons were seen in the PMT based on looking at the scope trace. | ||
Revision as of 02:16, 29 February 2008
DC HV and Gas
90/10 ArCo2
| HV settings | ||
| Wire | Volts | current (A) |
| Sense | 1500 | |
| Field | -750 | |
| Guard | 750 | |
Beam tuning
- The gun voltage was turned to zero and we saw no events in the rear scintillator associated with the gun pulse. We believe there are no electrons from the cavities (Field Emission).
- The gun voltage was put 0.35 and only single electrons were seen in the PMT based on looking at the scope trace.
- The gun voltage was put 0.4 and saw 10% of the pulses may be multiple electrons were seen in the PMT based on looking at the scope trace.
- The gun voltage was put 0.45 and saw 10% of the pulses may be multiple electrons were seen in the PMT based on looking at the scope trace.
- The gun voltage was put 0.5 and saw 10% of the pulses may be multiple electrons were seen in the PMT based on looking at the scope trace.
- The gun voltage was put 0.8 and started to see increase in multiple electrons were seen in the PMT based on looking at the scope trace.